<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .a{
        background-color: chocolate;
            height: 750px;

        }
        .b{
            background-color: cornflowerblue;
            height: 750px;
            background-image: url("img/China.png");
            background-attachment: fixed;
        }
        .c{
            background-color: crimson;
            height: 750px;
        }
        .d{
            background-color: darkblue;
            height: 750px;
            background-attachment: fixed;
            background-image: url("img/China.png");
        }
        .e{
            background-color: darkblue;height: 750px;
        }
    </style>
</head>
<body>
    <div class="a"></div>
    <div class="b"></div>
    <div class="c"></div>
    <div class="d"></div>
    <div class="e"></div>
</body>
</html>